Otherwise you get a lot of this action:

WARNING: 10.254.254.203 (iqn.1993-08.org.debian:01:5ad48b44316d): session reinstatement from different address 10.254.254.201

The issue was that we would restart iscsid after changing the name, but if the
iSCSI sessions were already open, the name change would not immediately take
effect (til next reboot).

This will happen if the open-iscsi and/or iscsid service is started at boot time
prior to the Emulab blockstore config running. We explicitly turned these services
off in Ubuntu 14, but not in 16 and above cuz that would involve interaction with
systemd and some of us don't speak systemd. Anyway, this will work even if the
services are enabled at boot.